Fujitsu AOU18RLXFZH - Page 31

Indoor heat exchanger
temperature rises
5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )
On heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat exchanger temperature sensor.
( Fig. 21 : Heating overload protection control )
145.4°F(63°C)
Compressor is OFF
The compressor frequency is
decreased 10rps every 20 seconds.
7. COMPRESSOR TEMPERATURE PROTECTION
Compressor temperature sensor is monitoring the compressor temperature.
When the compressor temperature sensor detects higher than Temperature , the compressor is stopped.
6. HIGH PRESSURE PROTECTION
When the pressure switch becomes OFF (Open : higher than 609.2 psi / 4.2 MPa),
the compressor is stopped.
It is released when the pressure switch becomes ON (Close : lower than 464.1 psi / 3.2 MPa)
after 3 minutes of compressor stop.
When the pressure switch is opened for 10 seconds from power on, all of outdoor unit operation is stopped.
The outdoor unit will start up if the pressure switch is returned to ON after 10 seconds has passed.
When 10 minutes (Cooling) or 3 minutes (Heating) has passed from the compressor stop and
pressure switch becomes ON, protection is released and the compressor will restart.
(1).
(2).
226°F
(108°C)
176°F
(80°C)
AOU18RLXFZH
AOU24RLXFZH
Temperature
Temperature
When 3 minutes has passed from the compressor stop and the compressor temperature sensor detects
lower than Temperature , protection is released and the compressor will restart.
132.8°F(56°C)
A°F(A°C)
B°F(B°C)
C°F(C°C)
Outdoor heat exchange
tempreture
12.2°F(-11°C)
Stable range
Release
=
<
Th
8.6°F(-13°C)
=
<
Th<
12.2°F(-11°C)
5°F(-15°C)
=
<
Th<
8.6°F(-13°C)
-13°F(-25°C)
=
<
Th<
5°F(-15°C)
-20.2°F(-29°C)
=
<
Th<
-13°F(-25°C)
Th< -20.2°F(-29°C)
In one operation of
the indoor unit : Qu air than
All indoor unit opeate, : Qu air
125.6°F
(54°C)
129.2°F
(54°C)
125.6°F
(52°C)
122.0°F
(50°C)
113.0°F
(45°C)
125.6°F
(52°C)
125.6°F
(52°C)
122.0°F
(50°C)
118.4°F
(48°C)
109.4°F
(43°C)
118.4°F
(50°C)
122.0°F
(50°C)
122.0°F
(50°C)
114.8°F
(46°C)
113.0°F
(45°C)
114.8°F
(48°C)
118.4°F
(48°C)
118.4°F
(48°C)
111.2°F
(44°C)
109.4°F
(43°C)
A°F
(A°C)
A°F
(A°C)
B°F
(B°C)
122.0°F
(50°C)
118.4°F
(48°C)
114.8°F
(46°C)
111.2°F
(44°C)
102.2°F
(39°C)
C°F
(C°C)
B°F
(B°C)
The compressor frequency is
decreased 25rps every 120 seconds.
The compressor frequency is
decreased 4rps every 120 seconds.
Release
Indoor heat exchanger
temperature rises
145.4°F(63°C)
Compressor is OFF
The compressor frequency is
decreased 10rps every 20 seconds.
132.8°F(56°C)
A°F(A°C)
B°F(B°C)
C°F(C°C)
Stable range
Release
The compressor frequency is
decreased 15rps every 120 seconds.
The compressor frequency is
decreased 2rps every 120 seconds.
Release
01-28
114.8°F
(46°C)
114.8°F
(46°C)
114.8°F
(46°C)
104.0°F
(40°C)
102.2°F
(39°C)
104.0°F
(40°C)
100.4°F
(38°C)
104.0°F
(40°C)
100.4°F
(38°C)
93.2°F
(34°C)
93.2°F
(34°C)
C°F
(C°C)
AOU18RLXFZH AOU24RLXFZH